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package models;

import java.util.*;
import javax.persistence.*;
import play.data.validation.MaxSize;
import play.data.validation.Required;
import play.db.jpa.*;

/**
 *
 * @author ezubia
 */
@Entity
public class Post extends Model {
    @Required
    public String title;
    @Required
    public Date postedAt;

    @Lob
    @Required
    @MaxSize(100000)
    public String content;

    @Required
    @ManyToOne
    public User author;
    
    @OneToMany(mappedBy = "post", cascade = CascadeType.ALL)
    public List<Comment> comments;

    @ManyToMany(cascade=CascadeType.PERSIST)
    public Set<Tag> tags;
        
    public Post(User author, String title, String content) {
        this.comments = new ArrayList<Comment>();
        this.tags = new TreeSet<Tag>();
        this.author = author;
        this.title = title;
        this.content = content;
        this.postedAt = new Date();
    }
    
    public Post addComment(String author, String content) {
        Comment newComment = new Comment(author, this, content).save();
        this.comments.add(newComment);
        this.save();
        return this;
    }
    public Post previous()
    {
        return Post.find("postedAt <? order by postedAt desc", postedAt).first();
    }
    
    public Post next()
    {
        return Post.find("postedAt > ? order by postedAt asc", postedAt).first();
    }
    
       
    public Post tagItWith(String name){
        tags.add(Tag.findOrCreateByName(name));
        return this;
    }
    
    public static List<Post> findTaggedWith(String tag){
        return Post.find(
                "select distinct p from Post p join p.tags as t where t.name =?", tag 
        ).fetch();
    }
    
    public static List<Post> findTaggedWith(String... tags) {
    return Post.find(
            "select distinct p from Post p join p.tags as t where t.name in (:tags) group by p.id, p.author, p.title, p.content,p.postedAt having count(t.id) = :size"
    ).bind("tags", tags).bind("size", tags.length).fetch();
}
    public String toString(){
    return title;
}
    
    
    
    
}
